Sound-wave amplifying device



BEST AVAELABLE QCPA May 4 1926. 1,583,565

c. T. ASBURY SOUND WAVE AMPLIFYING DEWICE Filed Oct. 25, 1924 Patented May 4, 19 26.

UNITED STATES? seer a elitism PATENT OFFICE.

CHARLES I. ASBURY, OF PHILADELPHIA, PENNSYLVANIA. ASS IGNOR TO THE ENTER- PBISE MANUFACTURING COMPANY OF PENNSYLVANIA, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

SOUND-\VAVE AMPLIFYING DEVICE.

Application filed October 25. 1924. Serial No. 745,909.

To all whom it may concern:

Be itlrnown that I, CHARLES '11 AsnUaY, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Sound-Valve Amplilying Devices; of which the following is a specification.

My invention relates to certain improvements in sound Wave amplifying devices known as radio loud speakers.

The object of my invention is to simplify the construction ofthe device and to make it. compact and substantial.

in the accompanying drawing,

Fig. 1 is a front view of myt'siinproved ainplit'ying device; i

1 Fig. 2 is a side view:

Fig. 3 is a vertical sectional view of the body portion,'thc translating device bein; in full lines; and,.l

Fig. i is a sectional plan vievv showing the translating device in full lines.

The body 1 of the amplifying, device is made oi cast. metal and has a hemispherical section 2 and a base 3. The front of the .-heinispherical section is open and has lugs 4 to which is attached a. sheet metal disc by screws 6. The plate has a serics of openessential features of the invention.

ings 7 near its periphery and in the openings arescreeus 9 of any suitable mesh. At

- threaded projection 12 perforated tor the passage of the sound. Screwed on to this extension is a born 13 made of cast; metal and flared as shown in Figs}; and 4. The 'horn terminates some distance away from the hemispherical section 2 so that the sound can escape between the horn and the section as indicated by the arrows in Fig. 3, the shape of the section 2 being such as to de fleet the sound into the room in which the device is located \vithout distortion. The sound is substantially free of vibration, pro- (lacing. a clear tone. The horn 13 has lateral to lugs 15 cast-integral with the body 1. 17. 17 are binding posts to which the conducting u i res are attached.

' I cla'iin:

1. The combination a sound amplify ing deviceof a hemispherical body portion: a horn located Within the helm-spherical body portion and terminating short of the inner surface thereof; means for securing the horn to saidbody-portion; and a translating device, attached to the horn, located.

metal disc secured to the open front of the said section. said disc being perforated and having an openingin the middle; a translating device located back of the said disc and having a knob projecting through the central opening; and a horn connecting the translating device with the body portion, said horn terminating short of the inner surface of the body portion.

extensions 14 which are secured by screws 16 3. The combination in a sound ,wave aniplit'ying device, ofa hemispherical bodyportion; a perforated plate secured to the i open face of the said body portion; lugs on the body portion; a horn secured to the lugs; atranslating device located directly back of the plate; a screw threaded projection on the hornextending into the screw threaded opening in'the translating device; and a knob on the translating device extending through a central opening in the plate.

CHARLES T. ASBURY. 

